Problem
1. Write a general scale Up function that takes in any picture and an integer x, and creates and returns a new picture x times as big using make Empty Picture (width,height).
2. Write a general scale Down function that takes in any picture and an integer x, and creates and returns a new picture 1/x as big using make Empty Picture (width,height).
3. Modify any of the functions from the last chapter to use a nested loop. Check the result to make sure it still does the same thing.